Rod-clamp.



H. H. LAMPERT.

ROD CLAMP.

APPLICATION F II.ED APR-l6.1913. 1,171,525. Patented Feb. 15,1916.

III! m nerafor HENRY H. LAMPERT, OF CHICAGO, ILLINOIS.

ROD-CLAMP.

Specification of Letters Patent.

Patented Feb. 1 5, 1916.

Application filed April 16, 1913. Serial No. 76i 51.

Clamps, of which the following is a specification.

The main objects of the invention are to provide improved means for securing together the sections of molds for concrete forms; to provide improved means for securing the connecting rods to the mold, not requiring that the rods be threaded and thereby make diflicult the removal of said securing means or the rods due to cement collecting on the threaded parts of said rods; to provide improved means for securing the connecting rods to mold walls and adapted to engage plain unthreaded rods of any length; to provide an improved form of clamp having a passage therethrough ovoid in transverse outline, or of such shape that a rod passing through said passage may be wedged therein; to provide a releasable clamp adapted to bend a rod at its point of application thereto and thereby prevent slipping between said clamp and rod; to provide a clamp of this nature which may be fitted to rods having cross sections and of different thickness and still securely grip the same; and to provide a. clamp which may be quickly secured to or released from iods at any point along their lengths.

An illustrative embodiment of this'invention is shown in the accompanying drawings, in which Figure 1 is a plan view of a form for a concrete column showing rod clamps, constructed according to the present invention, applied to the rods thereof. Fig. 2 is a detail representing an end view of the clamp. Fig. 3 is a plan of the detail shown in Fig. 2. Fig. 4 is a sectional view of the clamp showing it applied to-a rod.

The present invention relates to rod clamps for securing together the walls of concrete molds and may be quickly applied to the rods thereof or removed therefrom.

Referring to the drawings, in Fig. 1 there is shown a wooden form 1 for a concrete column. Surrounding this form'are metallic bars 2 having holes 3 in their ends through which are passed rods 4. Applied to the ends of the rods 4 o clamp the bars 2 together and thereby prevent displacement of the form 1 when the concrete is poured, are the improved rod clamps 5, these clamps being provided with set screws 6 threaded therein and engaging the rods 4.

The clamps 5 are in the form of a collar '7 (Fig. 3) having an annular flange 8 at its enlarged end. Passing longitudinally through the clamp is an opening 9. This opening is preferably ovoid in transverse outline and at its smaller side is provided with a depression 10 (Figs. 2 and 4). This depression provides a pair of semi-annular or perimetric shoulders or teeth 11 and the shoulders cooperate with the set screw 6 threaded into a threaded hole 12 in the clamp 5. The set screw enters the opening 9 at its larger side 13 between the shoulders 11 and thereby serves to both wedge the tie rod 4 into the smaller side 14 of the opening and to slightly bend the same between the shoulders 11. In this manner the rod is gripped by being in contact with the set screw at one side and in contact with the walls of the opening or passage 9 at a plurality of points where it engages the shoulders 1], either at the sides or the bottom of the small end 14 of the passage (Fig. 4).

A jack is employed to pull outwardly on the rods 4 while forcing the clamps 5 into contact with the walls of the concrete form.

By this means when the rods 4 and clamps 5 are forced into the desired relative posi' tions the clamps may then be secured, to the rods-by screwing the set screws 6 into ongagement with the rods.

From the foregoing it may be seen that the present invention provides improved means whereby the walls of the molds for concrete forms may be set and secured in place or removed with little loss of time due to manipulation of the securing means for said walls.

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that some of the details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims.

I claim 1. A clamp for the purpose described, having an external bearing surface and an open ing passing therethrough to receive a rod, said opening being ovoid in transverse outline, a pair of shoulders in the smaller side of said opening having opposing inwardly facing biting corners, and a set screw properly' threaded into said clamp to engage arod intermediate said shoulders and force the rod into contact therewith.

2. A clamp for the purpose described, having an external bearing surface and an opening passing therethrough to receive a rod, said opening being substantially ovoid in transverse outline, a pair of shoulders in the smaller side of said opening, one of said shoulders having an inwardly facing biting corner, and a set screw properly threaded into said clamp to engage a rod intermediate said shoulders and forcethe rod into contact therewith.

Signed at Chicago, this 14th day of April, 1913.

H. H. LAMBERT.

Witnesses:

RUnow RUMMLER, M. IRENE Hu'rcnmes. 

